P0ABB
DTC P0ABB, P0ABC, or P0ABD
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P0ABB
- Hybrid Battery Voltage Circuit Performance
DTC P0ABC
- Hybrid Battery Voltage Circuit Signal Low
DTC P0ABD
- Hybrid Battery Voltage Circuit Signal High
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The battery energy control module (BECM) monitors the voltage values of the hybrid batteries in different ways. The BECM monitors the calculated battery voltage (sum of the voltages from the 20 individual battery measurements) and the terminal voltage (total bus voltage measured on the output side of the high voltage relay contactors). The BECM compares these two voltage readings and looks for a difference.
Conditions for Running the DTC
* The vehicle power mode is RUN.
* Accessory voltage is 9-18 volts.
* High voltage relay contactors have passed the pre-charge sequence and remained closed.
Conditions for Setting the DTC
P0ABB
The BECM determines a 70 volt difference between the hybrid battery pack calculated voltage and the hybrid battery terminal voltage.
P0ABC
The BECM detects the terminal voltage is less than 169 volts.
P0ABD
The BECM detects the terminal voltage is greater than 407 volts.
Action Taken When the DTC Sets
DTCs POABB, P0ABC, and P0ABD are Type B DTCs.
Conditions for Clearing the DTC
DTCs POABB, P0ABC, and P0ABD are Type B DTCs.
Special Tools
EL-48900 HEV Safety Kit
Circuit/System Verification
1. Verify that DTC P0B3C, P0B41, P0B46, P0B4B, P0B50, P0B55, P0B5A, P0B5F, P0B64, P0B69, P0B6E, P0B73, P0B78, P0B7D, P0B82, P0B87, P0B8C, P0B91, P0B96, P0B9B, P0B3D, P0B42, P0B47, P0B4C, P0B51, P0B56, P0B5B, P0B60, P0B65, P0B6A, P0B6F, P0B74, P0B79, P0B7E, P0B83, P0B88, P0B8D, P0B92, P0B97, P0B9C, P0B3E, P0B43, P0B48, P0B4D, P0B52, P0B57, P0B5C, P0B61, P0B66, P0B6B, P0B70, P0B75, P0B7A, P0B7F, P0B84, P0B89, P0B8E, P0B93, P0B98, or P0B9D is not set.
^ If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions
2. Ignition ON, engine OFF, verify that the hybrid battery pack calculated voltage parameter and the hybrid battery terminal voltage parameter are greater than 169 volts.
3. Ignition ON, engine OFF, verify that the hybrid battery pack calculated voltage parameter and the hybrid battery terminal voltage parameter are less than 407 volts.
4. Ignition ON, engine OFF, verify that the hybrid battery pack calculated voltage and the hybrid battery pack terminal voltages are within 70 volts of each other.
5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.
The High Voltage Disabling procedure will perform the following tasks:
* Identify how to disable high voltage
* Identify how to test for the presence of high voltage
* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.
* Failure to follow the procedures exactly as written may result in serious injury or death.
Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling.
1. Remove the drive motor generator battery case upper cover, front cover and right side cover.
2. Connect the 12 battery.
3. Ignition ON, engine OFF, connect a DMM between B+ and B- terminals of the HV positive relay. With a scan tool, command the HV positive relay ON. Verify less than 0.5 ohms of resistance.
^ If the resistance is greater than the specified value, replace the HV positive relay.
4. Ignition ON, engine OFF, connect a DMM between B+ and B- terminals of the HV negative relay. With a scan tool, command the HV negative relay ON. Verify less than 0.5 ohms of resistance.
^ If the resistance is greater than the specified value, replace the HV positive relay.
5. Ignition OFF, verify 169-407 volts between terminals B+ at the HV positive relay and B- at the HV negative relay.
^ If the voltage is not within the specified range, test the 300 volt reference circuit for an open/high resistance. If the circuit tests normal, replace the BECM.
6. Ignition OFF, verify 215-407 volts between terminals B+ at the HV positive relay and B- at the HV negative relay.
^ If the voltage is below 194 volts, replace the drive motor generator battery.
^ If the voltage is above 407 volts, replace the drive motor generator control module.
^ If the voltage is between 194-215 volts, perform the jump assist. Refer to Jump Assist.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair. Verification Tests
* Drive Motor Generator Battery Replacement
* Drive Motor Generator Battery Control Module and Bracket Replacement